In this paper will be reported the study and implementation of a single stage High Power Factor (HPF) electronic ballast for High Pressure Sodium (HPS) lamps using a Half-Bridge Boost Rectifier integrated with an Electronic Ballast based in a LCC filter. In the recent years many authors are working to obtain single stage HPF electronic ballast for fluorescent lamps [1-3]. Normally to obtain HPF...

An improved topology of a voltage-fed quasi-resonant soft switching LCrCdc series-parallel half bridge inverter with a constant-frequency for electronic ballast applications is proposed in this paper. This new topology introduces a low-cost solution to reduce switching losses and circuit rating to achieve high-efficiency ballast. Switching losses effect on ballast efficiency is discussed throug...

This paper presents findings of a railroad ballast Discrete Element Modeling (DEM) research study focused on investigating ballast settlement under repeated wheel loading. In this approach, the ballast layer is modeled as an assembly of aggregate particles, AREMA No. 24 ballast gradation with different shapes and angularities and rough surface textures. The study matrix considered three differe...

An improved topology of a voltage-fed quasi-resonant soft switching LCrCdc series-parallel half bridge inverter with a constant-frequency for electronic ballast applications is proposed in this paper. This new topology introduces a low-cost solution to reduce switching losses and circuit rating to achieve high-efficiency ballast. Switching losses effect on ballast efficiency is discussed throug...

Cases of bioinvasion in Brazil and abroad have been causing serious environmental economic problems great order. such as the golden mussel, zebra North Pacific star, among others, caused fishing activity, industry, cases clogging coolers maintenance hydroelectric turbines. The cholera epidemic took place a long time ago, this was also due to transport ballast between continents. Onshore water t...

The introduction of species to habitats to which they are nonindigenous is a principal form of global change (Lawler et al., 2006). Introduction of non-indigenous species (NIS) has increased in both terrestrial and aquatic environments worldwide commensurate with increased global trade and travel (see Ruiz & Carlton, 2003). Human populations are utterly dependent on ships for global commerce, w...